Thermophysical properties of liquid CaO-SiO2-Al2O3-MgO-TiO2-V2O3 slags

The present work investigated the effect of V2O3 in the range of 0 to 10.5 wt% on the thermophysical properties (viscosity, density, and surface tension) of CaO-SiO2-Al2O3-MgO-TiO2 slags with the CaO/SiO2=1.3 and varied content of Al2O3 and TiO2. The obtained experimental results were then supported by thermodynamic calculation with FactSage 7.2. The results shown that, with the increase of the V2O3 content, the viscosity of all studied slags decreased. Moreover, the addition of TiO2 up to 10 wt% to the matrix slag led to a decrease in viscosity and the addition of Al2O3 up to 20 wt% increased the viscosity without the presence of V2O3. Thereby the behavior of critical temperature on all viscosity curves corresponded with the behavior of crystallization temperature of melilite. The increase in the content of V2O3 to 10.5 wt% in all slags with and without additional TiO2 or Al2O3 resulted in an increase in density at temperatures of 1450–1650°C. The surface tension increased with increasing Al2O3 content and decreased with increasing TiO2 and V2O3.